Maglev Trains
Why in News?
Maglev trains are in recent global news because Japan has officially approved construction on the nine-year political deadlock over environmental concerns Shizuoka section of its 500 km/h Chuo Shinkansen line.
About
- Portmanteau: The word stands for Magnetic Levitation.
- No Wheels: It completely ditches traditional mechanical wheels, axles, and steel tracks.
- Frictionless Movement: Because the train completely floats above a specialized track (guideway), it encounters zero rolling friction.
- High Operational Speeds: It easily tops 400 km/h to 500 km/h in service. Japan’s experimental SCMAGLEV holds the absolute world record at 603 km/h.
- Levitation (Lifting): It uses electromagnetic forces—which are vastly stronger than Earth's gravity—to lift heavy train bodies weighing 150 to 500 tonnes.
- Suspension Types:
- Electromagnetic Suspension (EMS): Uses attractive forces to pull the train upward, maintaining a tiny hover gap of 10 mm (used in China's Shanghai Maglev).
- Electrodynamic Suspension (EDS): Uses repulsive forces from superconducting magnets to push the train up to 100 mm off the track, offering higher stability (used in Japan's SCMAGLEV).
- Propulsion (Moving Forward): Alternating current (AC) runs through the track walls, creating shifting magnetic poles that continuously pull and push the train forward.
- All-Weather Reliability: Since the vehicle hovers, operations are entirely unaffected by surface hazards like heavy snow, ice, or torrential rain.
- Zero Derailment Risk: The train structure physically wraps around or sits deeply within the guideway walls, making derailment virtually impossible even during massive earthquakes.
- Low Wear & Tear: No friction translates into an incredibly smooth ride for passengers and significantly less track degradation over decades of use.
- Extremely Capital Intensive: Precision engineering for magnets and coils makes infrastructure incredibly expensive.
- Zero Compatibility: Maglev trains cannot cross over or run on existing standard railway tracks or regular city platforms.
- Aerodynamic Drag: Traveling faster than 300 km/h creates heavy air resistance, meaning the trains require immense power consumption and hyper-aerodynamic "bird-beak" front noses to pass through the atmosphere efficiently.
